People jump out of planes, base jump, climb mountains, travel to the Congo, travel to areas with high levels of malaria and put themselves at "risk" on a regular basis.
Anyone expecting that human behaviour was going to change for a long period for a virus with this level of mortality was naive to say the least. Outbreaks in Melbourne, Lisbon, Texas etc etc were always going to happen. Hell you saw the party on the Charles Bridge right? For many, the idea that life is simply "too short" was always going to take precedent after a few months, even moreso after being locked indoors.
It's not about "common sense" in my humble opinion.
If anything I'm surprised that so many countries appear to be doing such a great track and trace job despite this.